JP2590775Y2 - Bellows type expansion joint - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows type expansion joint which is optimally used for connecting a fuel pipe of a diesel engine or a gas engine or connecting a pipe used in a waste gas system.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, connecting pipes S and S 'used as fuel pipes for supplying fuel to an engine E used in an automobile or the like are connected to each other, or the engine E is connected to the connecting pipe S or S'. The engine E is used to connect the joint pipes S and S 'used as pipes of the exhaust gas system for exhausting.
Bellows-type telescopic joints are used to cope with vibrations caused by the driving of the vehicle and vibrations caused by running the automobile.

FIG. 4 shows an example of this bellows type expansion joint. That is, the joint pipes S, S '
Flanges F and F ', which respectively abut against the flanges f and f' provided at the ends of the pipe, are fixed to the left and right sides of the bellows body B, and one end of a protective cylinder H for protecting the bellows body B is connected to the flanges F and F '. F ′.

When connecting the joining pipes S, S 'through bellows type expansion joints, flanges F, F' fixed to both ends of the bellows body B are connected to the joining pipes S, S 'via sealing materials or the like. After abutting the flanges f, f ', bolts V, V' are inserted into bolt insertion holes provided in the flanges F, f; F ', f', and tightened and fixed with nuts N, N '. Thereby, the joint pipes S and S 'are connected to each other via the bellows main body B.

[0005]

The conventional bellows type pipe joint shown in FIG. 4 has a degree of freedom in the direction of the axis Y, which is the longitudinal direction of the bellows body B, as the bellows body B expands and contracts. However, the direction of the axis X substantially intersecting with the axis Y corresponds to the flanges F and F 'fixed to both ends of the bellows body B.
Are connected to the flanges f, f 'of the joint pipes S, S' by the bolts V, V 'and the nuts N, N'. Only the allowance provided between the bolt insertion holes provided in F and F 'and the inner diameter of the bolt insertion holes could exhibit the degree of freedom.
Accordingly, when the metal bellows body B is attached to the joining pipes S and S ', an excessive stress due to torsion is applied to the metal bellows body B, and the bellows body B may be cracked or damaged, thus lacking durability.

The present invention solves this conventional drawback, and has a durable bellows type expansion and contraction joint which is not cracked or damaged by the stress caused by torsion when the metal bellows body is attached to the flange of the joint pipe. To provide

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a flank provided at one end of one joint pipe joined to one of a metal bellows main body.
The bellows body is provided with a fixed flange for attachment to the
The bellows type expansion joint provided with a rotatable mounting flange that is attached by a
A locking portion on one end of the body, to which the floating flange can be engaged
Protection tube arranged on the inner circumference of the product and the outer circumference of the bellows body
The small-diameter mounting concave end of approximately the length to which the small-diameter end of the
Forming the locking part and the joining pipe facing the locking part.
The entire surface of both left and right sides pressed against the flange
The shape of the seal is approximately annular,
A means of intervening was adopted.

[0008]

The metal bellows body expands and contracts in the direction of the axis Y to exhibit a degree of freedom. A small diameter provided on one side of the bellows body
Since the locking part is secured to a mounting recess idler flange for mounting is locked rotatably, furan joint tube
When the bellows body is twisted when mounted on the bellows, the floating flange is rotated with respect to the bellows body.
Then, a flange provided at the pipe end of one of the joined pipes and a floating flange engaged with a locking part provided at one of the bellows main bodies are tightened with bolts and nuts to thereby provide a protective cylinder.
Locking part fixed to one end of small diameter and overall shape is approximately front
By polymerizing and cross section plate-shaped sealing member an annular Ru <br/> be clamped.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a bellows main body formed by using a thin metal plate. The bellows main body 1 is formed by forming a large number of curved portions 1a having a substantially corrugated cross section, so that the bellows main body 1 can be expanded and contracted in an axial Y direction as a longitudinal direction and is flexible. Will be possible.

[0010] 1b is Ri mounting recess der small-diameter circular ring formed at one end of the bellows body 1, the mounting recess 1b
On the inner periphery of the locking part 3 and the outer periphery of the bellows body 1
One end 5a of small diameter provided on the closed end side of the protection cylinder 5 to be arranged
There Ru is formed in Ryakucho of being secured.

Reference numeral 2 denotes a fixing flange for attachment fixed to one end of the bellows main body 1, and bolt holes 2a are formed in the fixing flange 2 at equal intervals.

Reference numeral 3 denotes a substantially annular locking part. The locking part 3 is fitted to the end of the mounting recess 1b provided at the other pipe end of the bellows main body 1, so that the inner periphery thereof is formed. Taking
The other part of the bellows body 1 is welded to the outer periphery of the attached concave portion 1b.
To the other end of the tube . The mounting recess of the bellows body 1
When the locking part 3 is fixed to 1b by welding or the like
And a small annular mounting recess 1b of the bellows main body 1.
Of the protection tube 5 described below, which is arranged on the outer periphery of the bellows body 1
The small end 5a on the closed end side is fixed together by welding or the like.
It is. At this time, with respect to the mounting recess 1b of the bellows main body 1,
The protection cylinder 5 and the locking part 3 are connected from the pipe end side of the bellows main body 1.
Welding work can be performed easily and reliably, and locking parts 3
And the protective cylinder 5 have sufficient contact area with the bellows body 1
With this structure, it can be mounted firmly and compactly.

Reference numeral 4 denotes a floating flange for mounting, which is rotatably fitted in the mounting recess 1b of the bellows main body 1 by being locked to the locking part 3 provided at the other end of the bellows main body 1. The floating flanges 4 are provided with bolt insertion holes 4a at appropriate intervals.

The bellows 5 prevents the bellows body 1 from being cracked or broken by a flying stone, or prevents the internal fluid from being directly scattered from the inside of the bellows body 1 to the surroundings when a crack is generated. a protective tube covering the outer periphery of the bellows body 1 to protect the body 1, the protective tube 5 is the
As described above, the small-diameter end 5a located on the closed end side is welded so that the inner periphery of the locking part 3 and the outer periphery of the mounting recess 1b of the bellows main body 1 come into close contact with each other. The other end 5b of the protection cylinder 5 is disposed with a predetermined gap K between the other end 5b and the fixed flange 2, thereby restricting the compression of the bellows body 1 in the axial direction Y as a longitudinal direction to a certain limit.

Reference numerals 7 and 8 denote joining pipes to be connected. Reference numeral 9 denotes a flange provided at the pipe end of the joining pipe 7, and reference numeral 10 denotes a flange similarly provided at the pipe end of the joining pipe 8.

Reference numeral 9a denotes a bolt insertion hole provided in the flange 9 at the pipe end of the joining pipe 7. The floating flange 4 provided on one side of the bellows main body 1 and the flange 9 are substantially opposed to the floating flange 4, and bolts 11 are inserted into bolt insertion holes 4a and 9a provided respectively. The bellows main body 1 is connected to the joining pipe 7 by screwing and tightening a nut 12 to the bolt 11.

Further, after the flange 10 of the joining pipe 8 is abutted against the fixing flange 2 fixed to the other end of the bellows main body 1, a bolt 13 is inserted into the bolt insertion holes 2a, 10a provided respectively. A nut 14 is screwed into the bolt 13 and tightened to connect the bellows body 1 to the joining pipe 8.
Connect to

Reference numeral 15 designates a generally annular front section and a substantially cross-sectional view.
A plate-shaped sealing member, the sealing member 15 is entirely in the right and left side surfaces are pressed by being polymerized <br/> interposed between the locking part 3 and the flange 9 of the joint tube 7 It is reliably prevent leakage of fluid flowing through the junction pipe 7, 8 Then DOO
Bellows body 1 stably without any gap or backlash on the press contact surface
And the protection cylinder 5 .

One embodiment of the present invention is constructed as described above. In order to connect the joining pipes 7 and 8 via the metal bellows main body 1, the flanges 9 and 8 of the joining pipes 7 and 8 to be connected are used.
10, the floating flange 4 for mounting provided on one side of the bellows main body 1 and the fixed flange 2 provided on the other side of the bellows main body 1 are opposed to each other, and bolt insertion holes 4a, 9a;
a, 10a and bolts 1 and 13
The nuts 12 and 14 are screwed into the nuts 1 and 13, and the joint pipes 7 and 8 are connected to the front and rear thereof via the bellows main body 1 by tightening.

At this time, if the metal bellows body 1 vibrates or twists in the axis X direction substantially intersecting with the axis Y direction corresponding to the axial length direction, it is provided at one end of the bellows body 1. A substantially annular locking part 3 is mounted in the annular mounting recess 1b.
Since the floating flange 3 is rotatably fitted with respect to the above, the floating flange 4 is rotated and provided on the flange 9 of the joining pipe 7 so that the metal bellows main body 1 does not twist. The bolt insertion hole 9a and the bolt insertion hole 4a formed in the floating flange 4 are easily overlapped, the bolt 11 is inserted, and the nut 12 is screwed together, so that the flange 9 and the floating flange 4 can be connected. Therefore, since no stress or unreasonable force is generated in the metal bellows main body 1 due to twisting, cracking or breakage is prevented.

When the engine E is driven to generate vibrations or when the automobile runs and vibrates, the bellows main body 1 has a large number of curved portions 1a extending and contracting in the direction of the axis Y corresponding to the longitudinal direction. , 8 and keeps the connection state of the joint pipes 7, 8 in good condition by following the movement in the longitudinal direction.

At this time, since the protection cylinder 5 for protecting the outer periphery of the bellows main body 1 has one end 5a attached to one of the mounting recesses 1b of the bellows main body 1, the bellows main body 1 expands and contracts in the axis Y direction. The protection tube 5 protects the bellows main body 1 by moving relative to the bellows main body 1 as it moves. And the other end 5b of this protection cylinder 5
Is disposed at an interval K with respect to the fixed flange 2 fixed to the other end of the bellows main body 1, so that the bellows main body 1 moves within a range until the other end 5b of the protective cylinder 5 collides with the fixed flange 2. To give it a degree of freedom.

Therefore, the protection cylinder 5 prevents the flying stones from directly colliding with the bellows main body 1. In addition, when the bellows body 1 is cracked or damaged, the fluid can be prevented from directly scattering to the surroundings. At this time, when the internal fluid flowing in the joining pipes 7 and 8 is particularly high in temperature, the protective cylinder 5 prevents the splashing directly around the joining pipes 7 and 8 and reduces the danger to the operator. Is done.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a locking part 3 welded to a mounting recess 1b provided on one side of a metal bellows main body 1 and the mounting recess 1b are provided. A ball bearing 20 as a rolling bearing means is interposed between the floating bearing 4 rotatably provided on the ball bearing 20 and the ball B of the ball bearing 20.
The bellows body 1 and the locking component 3
Thus, the frictional resistance of the floating flange 4 at the time of rotation is reduced, and the floating flange 4 is smoothly rotated. At this time, as the rolling bearing means, for example, a roller bearing is used in addition to the ball bearing 20 using the ball B as shown in the figure. The bolt insertion hole 4a provided in the floating flange 4 and the bolt insertion hole 9 provided in the flange 9 of the joining pipe 7 are provided.
a is easily and surely overlapped, and the nut 11 is attached to the bolt 11.
2 and the flange 9 and the floating flange 4 are screwed together.
And came to combine.

In the above embodiment, the floating flange 4
The locking part 3 for removing the metal is a metal bellows body 1
However, the locking part 3 may be formed integrally with the bellows body 1.

[0026]

As described above, according to the present invention, the metal bellows body can be connected to the joint pipe without cracking or breakage due to stress such as torsion, and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a side view showing a conventional example in a state in which a fuel pipe as a joining pipe and an exhaust pipe are connected to an engine.

4 is a cross-sectional view showing an example of a bellows type expansion joint used for connecting the joint pipes of an intake system and an exhaust system of the engine shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bellows main body 1b Mounting recess 2 Fixed flange 3 Locking part 4 Floating flange 5 Protective cylinder 11 Bolt 12 Nut 13 Bolt 14 Nut 15 Seal member 20 Ball bearing B Ball

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 27/12

Claims (3)

(57) [Scope of request for utility model registration] 1. A metal bellows body joined to one side
The fixing flange for mounting provided for one flange having the pipe end of the joint tube that, the other to the other bellows body
Tighten to the flange provided at the end of the joint pipe with bolts and nuts.
Vero provided with floating flanges for mounting to be sintered rotatably
Into a bellows type expansion joint, and the bellows body has one end
The inner periphery of the locking part with which the floating flange is
The small end of the protection cylinder located on the outer circumference of the rose
Forming a small-diameter mounting concave end of approximately the length to be attached,
Between the part and the flange of the joint pipe facing the locking part.
The entire shape of the entire left and right sides pressed against the front is a substantially ring
Bellows-type expansion joint without the Jo by polymerizing a substantially plate-shaped sealing member, characterized in and this <br/> interposing. Wherein said protective tube with a gap between the fixed flange and the other end as well as welding the small-diameter end provided on one of the bellows body to the inner periphery of the engaging parts of the bellows body
The bellows type expansion joint according to claim 1, wherein the bellows type expansion joint is arranged on an outer periphery . 3. A bellows body having a locking component provided on one side thereof and a floating flange rotatably provided with respect to the locking component, and a rolling bearing means interposed between the floating flange and the locking component. The bellows type expansion joint according to claim 1, wherein: